216711 has 18 divisors (see below), whose sum is σ = 345800. Its totient is φ = 130680.

The previous prime is 216703. The next prime is 216719. The reversal of 216711 is 117612.

It is an interprime number because it is at equal distance from previous prime (216703) and next prime (216719).

It is not a de Polignac number, because 216711 - 2³ = 216703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216719) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 990 + ... + 1188.

2²¹⁶⁷¹¹ is an apocalyptic number.

216711 is a deficient number, since it is larger than the sum of its proper divisors (129089).

216711 is a wasteful number, since it uses less digits than its factorization.

216711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 213 counting only the distinct ones).

The product of its digits is 84, while the sum is 18.

The square root of 216711 is about 465.5222873290. The cubic root of 216711 is about 60.0657612313.

Subtracting from 216711 its reverse (117612), we obtain a palindrome (99099).

The spelling of 216711 in words is "two hundred sixteen thousand, seven hundred eleven".